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Hydrothermal (NN)-N-15-N-15 abundances constrain the origins of mantle nitrogen 期刊论文
NATURE, 2020, 580 (7803) : 367-+
作者:  Zhao, Steven;  Jang, Cholsoon;  Liu, Joyce;  Uehara, Kahealani;  Gilbert, Michael;  Izzo, Luke;  Zeng, Xianfeng;  Trefely, Sophie;  Fernandez, Sully;  Carrer, Alessandro;  Miller, Katelyn D.;  Schug, Zachary T.;  Snyder, Nathaniel W.;  Gade, Terence P.;  Titchenell, Paul M.;  Rabinowitz, Joshua D.;  Wellen, Kathryn E.
收藏  |  浏览/下载：14/0  |  提交时间：2020/05/13

Nitrogen is the main constituent of the Earth'  s atmosphere, but its provenance in the Earth'  s mantle remains uncertain. The relative contribution of primordial nitrogen inherited during the Earth'  s accretion versus that subducted from the Earth'  s surface is unclear(1-6). Here we show that the mantle may have retained remnants of such primordial nitrogen. We use the rare (NN)-N-15-N-15 isotopologue of N-2 as a new tracer of air contamination in volcanic gas effusions. By constraining air contamination in gases from Iceland, Eifel (Germany) and Yellowstone (USA), we derive estimates of mantle delta N-15 (the fractional difference in N-15/N-14 from air), N-2/Ar-36 and N-2/He-3. Our results show that negative delta N-15 values observed in gases, previously regarded as indicating a mantle origin for nitrogen(7-10), in fact represent dominantly air-derived N-2 that experienced N-15/N-14 fractionation in hydrothermal systems. Using two-component mixing models to correct for this effect, the (NN)-N-15-N-15 data allow extrapolations that characterize mantle endmember delta N-15, N-2/Ar-36 and N-2/He-3 values. We show that the Eifel region has slightly increased delta N-15 and N-2/Ar-36 values relative to estimates for the convective mantle provided by mid-ocean-ridge basalts(11), consistent with subducted nitrogen being added to the mantle source. In contrast, we find that whereas the Yellowstone plume has delta N-15 values substantially greater than that of the convective mantle, resembling surface components(12-15), its N-2/Ar-36 and N-2/He-3 ratios are indistinguishable from those of the convective mantle. This observation raises the possibility that the plume hosts a primordial component. We provide a test of the subduction hypothesis with a two-box model, describing the evolution of mantle and surface nitrogen through geological time. We show that the effect of subduction on the deep nitrogen cycle may be less important than has been suggested by previous investigations. We propose instead that high mid-ocean-ridge basalt and plume delta N-15 values may both be dominantly primordial features.


  
Genotypic variation in phenological plasticity: Reciprocal common gardens reveal adaptive responses to warmer springs but not to fall frost 期刊论文
GLOBAL CHANGE BIOLOGY, 2019, 25 (1) : 187-200
作者:  Cooper, Hillary F.;  Grady, Kevin C.;  Cowan, Jacob A.;  Best, Rebecca J.;  Allan, Gerard J.;  Whitham, Thomas G.
收藏  |  浏览/下载：11/0  |  提交时间：2019/04/09
bud flush  bud set  climate change  common garden provenance trial  phenology  phenotypic plasticity  Populus fremontii  
Highly bioavailable dust-borne iron delivered to the Southern Ocean during glacial periods 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2018, 115 (44) : 11180-11185
作者:  Shoenfelt, Elizabeth M.;  Winckler, Gisela;  Lamy, Frank;  Anderson, Robert F.;  Bostick, Benjamin C.
收藏  |  浏览/下载：6/0  |  提交时间：2019/11/27
iron speciation  Southern  Ocean iron bioavailability  dust  productivity  
Seed origin and warming constrain lodgepole pine recruitment, slowing the pace of population range shifts 期刊论文
GLOBAL CHANGE BIOLOGY, 2018, 24 (1) : 197-211
作者:  Conlisk, Erin;  Castanha, Cristina;  Germino, Matthew J.;  Veblen, Thomas T.;  Smith, Jeremy M.;  Moyes, Andrew B.;  Kueppers, Lara M.
收藏  |  浏览/下载：19/0  |  提交时间：2019/04/09
climate change  demographic model  Pinus contorta  range shift  seed provenance  time lag  treeline  
A common thermal niche among geographically diverse populations of the widely distributed tree species Eucalyptus tereticornis: No evidence for adaptation to climate-of-origin 期刊论文
GLOBAL CHANGE BIOLOGY, 2017, 23 (12)
作者:  Drake, John E.;  Varhammar, Angelica;  Kumarathunge, Dushan;  Medlyn, Belinda E.;  Pfautsch, Sebastian;  Reich, Peter B.;  Tissue, David T.;  Ghannoum, Oula;  Tjoelker, Mark G.
收藏  |  浏览/下载：10/0  |  提交时间：2019/04/09
acclimation  autotrophic respiration  climate change  Eucalyptus tereticornis  forest red gum  local adaptation  photosynthesis  temperature  
Competing English, Spanish, and French alabaster trade in Europe over five centuries as evidenced by isotope fingerprinting 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2017, 114 (45) : 11856-11860
作者:  Kloppmann, W.;  Leroux, L.;  Bromblet, P.;  Le Pogam, P. -Y.;  Cooper, A. H.;  Worley, N.;  Guerrot, C.;  Montech, A. T.;  Gallas, A. M.;  Aillaud, R.
收藏  |  浏览/下载：6/0  |  提交时间：2019/11/27
alabaster  provenance  isotope fingerprinting  Middle Ages  Renaissance  
Adaptive and plastic responses of Quercus petraea populations to climate across Europe 期刊论文
GLOBAL CHANGE BIOLOGY, 2017, 23 (7)
作者:  Saenz-Romero, Cuauhtemoc;  Lamy, Jean-Baptiste;  Ducousso, Alexis;  Musch, Brigitte;  Ehrenmann, Francois;  Delzon, Sylvain;  Cavers, Stephen;  Chalupka, Wladyslaw;  Dagdas, Said;  Hansen, Jon Kehlet;  Lee, Steve J.;  Liesebach, Mirko;  Rau, Hans-Martin;  Psomas, Achilleas;  Schneck, Volker;  Steiner, Wilfried;  Zimmermann, Niklaus E.;  Kremer, Antoine
收藏  |  浏览/下载：13/0  |  提交时间：2019/04/09
climatic change  climatic transfer distance  mixed model  Quercus petraea  survival  tree growth  
Regional climate on the breeding grounds predicts variation in the natal origin of monarch butterflies overwintering in Mexico over 38 years 期刊论文
GLOBAL CHANGE BIOLOGY, 2017, 23 (7)
作者:  Flockhart, D. T. Tyler;  Brower, Lincoln P.;  Ramirez, M. Isabel;  Hobson, Keith A.;  Wassenaar, Leonard I.;  Altizer, Sonia;  Norris, D. Ryan
收藏  |  浏览/下载：7/0  |  提交时间：2019/04/09
Asclepias  carbon  Danaus plexippus  hydrogen  migratory connectivity  provenance  seasonal migration  stable isotopes  
Temporal dynamics in dominant runoff sources and flow paths in the Andean Paramo 期刊论文
WATER RESOURCES RESEARCH, 2017, 53 (7)
作者:  Correa, Alicia;  Windhorst, David;  Tetzlaff, Doerthe;  Crespo, Patricio;  Celleri, Rolando;  Feyen, Jan;  Breuer, Lutz
收藏  |  浏览/下载：11/0  |  提交时间：2019/04/09
Warming and provenance limit tree recruitment across and beyond the elevation range of subalpine forest 期刊论文
GLOBAL CHANGE BIOLOGY, 2017, 23 (6)
作者:  Kueppers, Lara M.;  Conlisk, Erin;  Castanha, Cristina;  Moyes, Andrew B.;  Germino, Matthew J.;  de Valpine, Perry;  Torn, Margaret S.;  Mitton, Jeffry B.
收藏  |  浏览/下载：7/0  |  提交时间：2019/04/09
alpine treeline  climate change experiment  Engelmann spruce  limber pine  Picea engelmannii  Pinus flexilis  seedling demography  species range shift